Cubic Foot per Minute to Liter per Hour (CFM to LPH)
Convert CFM to LPH — Flow Rate converter
One cubic foot per minute equals 1699.01 LPH, so to convert cubic feet per minute to liters per hour you multiply the value by 1699.01. A cubic foot per minute is larger than a liter per hour — going the other way, 1 LPH = 0.0005885778 CFM. For example, 10 CFM = 16990.11 LPH and 50 CFM = 84950.54 LPH.
1 CFM = 1699.01 LPH
Cubic Foot per Minute to Liter per Hour formula
1 Cubic Foot per Minute = 1699.01 LPH
Worked examples
- 25 CFM = 42475.27 LPH
- 100 CFM = 169901.08 LPH
Cubic Foot per Minute to Liter per Hour conversion table
| Cubic Foot per Minute (CFM) | Liter per Hour (LPH) |
|---|---|
| 1 | 1699.01 |
| 2 | 3398.02 |
| 3 | 5097.03 |
| 5 | 8495.05 |
| 8 | 13592.09 |
| 10 | 16990.11 |
| 12 | 20388.13 |
| 15 | 25485.16 |
| 20 | 33980.22 |
| 25 | 42475.27 |
| 50 | 84950.54 |
| 100 | 169901.08 |
| 250 | 424752.7 |
| 500 | 849505.4 |
| 1000 | 1699010.8 |
Which gallon, and which trade
The single most expensive mistake in flow conversion is the gallon. A US liquid gallon is 3.785411784 litres; an imperial gallon is 4.54609 litres. US GPM and imperial GPM differ by about 20%, and pump datasheets frequently do not say which one they mean. Check the manufacturer's country of origin before trusting a GPM figure.
Different trades default to different units for the same physical quantity: HVAC and compressed air work in CFM, plumbing and pumps in GPM or LPM, and process and water engineering in m³/h or L/s. A specification that mixes them is usually quoting different equipment, not different flows. On this page, 1 CFM = 1699.01 LPH.
CFM to metric is worth memorising: one cubic foot is exactly 0.028316846592 m³, so 1 CFM = 1.699011 m³/h and 1,000 CFM ≈ 1,699 m³/h. Note that CFM on a compressor may be quoted as free air delivery (FAD) at inlet conditions rather than at working pressure — the two are not interchangeable.
Frequently asked questions
How many liters per hour are in one cubic foot per minute?
One cubic foot per minute equals 1699.01 liters per hour (LPH).
How many cubic feet per minute are in one liter per hour?
One liter per hour equals 0.0005885778 cubic feet per minute (CFM).
How do you convert cubic feet per minute to liters per hour?
1 Cubic Foot per Minute = 1699.01 LPH. Use the calculator above for any value.
What is 5 CFM in LPH?
5 CFM = 8495.05 LPH.
What is 100 CFM in LPH?
100 CFM = 169901.08 LPH.
What is 10 CFM in LPH?
10 CFM = 16990.11 LPH.
What is 20 CFM in LPH?
20 CFM = 33980.22 LPH.
What is 50 CFM in LPH?
50 CFM = 84950.54 LPH.
What is 500 CFM in LPH?
500 CFM = 849505.4 LPH.
Is a cubic foot per minute bigger than a liter per hour?
Yes. A cubic foot per minute is larger — one cubic foot per minute equals 1699.01 liters per hour (LPH).